I was in BestBuy and they had two different adapters. One was for heat-producing appliances like curling irons and the other was for lower usage stuff like MP3 players. I'm wondering; do I need both or can I use the higher strength one for all needs? How many of them should I bring? Can anyone recommend good adapters?

Yeah, you will need an adaptor that reduces voltage to 110. Probably about $40!!!!

Seek one out well in advance of going to the airport, they will sting you. Better still, research where you will be staying in europe. You might not even have to take all that stuff overseas with you in the first place.

I bought a bunch of these when I moved to the UK to run all my US stuff on. I had one so big it ran my washer machine! I'm not sure about Greece, but Germany and Austria are the standard 2-pronged round plugs. Some of the power converters come with this already on it, so you may not need the adapter in addition to the converter. Most of the standard stuff will run at 50 hz, so I wouldn't worry about that. If you have time, I would definitely buy online. I have a few of the "travel" type that have a switch to go from 50 watts max to 1500 watts max. This is sort of a one-size fits all for travel as you can run an electric razor, mp3, etc. on the low watt setting and an iron or blow dryer on the 1500 watt setting. The high watt setting is only meant for short term use.